body {background: #335633;}
.corners {
     background: #66AB66 url(../Images/t-l.gif) top left no-repeat;
}
.corners div {
     background: url(../Images/t-r.gif) top right no-repeat; 
}
.corners div div {
     background: url(../Images/b-r.gif) bottom right no-repeat; 
}
.corners div div div {
     background: url(../Images/b-l.gif) bottom left no-repeat;
}
